The following DataNodes have no identifier: 4
http://classic.wikipathways.org/instance/WP3186_r117610 http://rdf.wikipathways.org/Pathway/WP3186_r117610/DataNode/e6dba (FBR)
http://classic.wikipathways.org/instance/WP3186_r117610 http://rdf.wikipathways.org/Pathway/WP3186_r117610/DataNode/e5f54 (FECHP1)
http://classic.wikipathways.org/instance/WP3186_r117610 http://rdf.wikipathways.org/Pathway/WP3186_r117610/DataNode/cba8c (MMP12)
http://classic.wikipathways.org/instance/WP3186_r117610 http://rdf.wikipathways.org/Pathway/WP3186_r117610/DataNode/b7444 (PRB1)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier